Pathological Features of the Atrioventricular Conduction System in Feline Cases of Third-degree Atrioventricular Block

SASAKI Takafumi, NAKAO Shu, KIMURA Yusuke, HIRAKAWA Atsushi, MACHIDA Noboru

doi:10.12935/jvma.73.315

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Other Title

猫の第3度房室ブロック症例にみられた房室伝導系病変
ネコノダイ3ドボウシツブロックショウレイニミラレタボウシツデンドウケイビョウヘン

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Abstract

<p>The hearts of 22 cats in which third-degree atrioventricular (AV) block had been diagnosed electrocardiographically were examined post mortem. The underlying heart disease consisted of 10 cases of hypertrophic cardiomyopathy, three cases of restrictive cardiomyopathy (endomyocardial form), two cases of arrhythmogenic right ventricular cardiomyopathy, and one case of old myocardial infarction; however, no remarkable changes were observed in six cats. Histological examination of the AV conduction system consistently revealed the marked reduction of conduction fibers due to fibrous replacement in the combined regions of the branching portion of the His bundle and the upper portion of the left bundle branch. The changes in the AV conduction system were invariably associated with marked fibrosis of the base of the central fibrous body and the upper part of the ventricular septum (sclerosis of the left side of the cardiac skeleton). The pathological process and predilection sites of the lesions resembled those observed in elderly human patients with idiopathic or primary heart block (Lev's disease).</p>

Journal

Journal of the Japan Veterinary Medical Association

Journal of the Japan Veterinary Medical Association 73 (6), 315-320, 2020-06-20

Japan Veterinary Medical Association

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